Green tetrakisazo dyes



Patented Aug. 31, 1948 GREEN TETRAKISAZO DYES Chiles E. Sparks, Wilmington, Dcl., James W. Libby, Jr., St. Matthews, Ky., and Joseph H. Trepagnier, Wilmington, Del., assignors to E. I. du Pont de Nemours &-Company, Wilmington, Del., a corporation of Delaware No Drawing. Application January 4, 1945, Serial No. 571,362

4 Claims. 1

This invention relates to new tetrakisazo dyes which are represented in general by the formula A X Y Z- B, the symbols of which are hereinafter fully described. The dyes of the present invention are suitable for dyeing cotton, regenerated cellulose and similar fibers in shades of green by direct dyeing methods. Treatment of the dyeings with formaldehyde results in dyeings in clear shades of green having exceptional washing fastness and excellent discharge properties.

Various dyes are known which produce bright green dyeings on cotton and similar fibers by direct dyeing methods. While the methods of producing these dyeings are economical, the dyeings do not meet the highest standards with respect to washing fastness. Green dyeings have also been produced on cotton with diazo dyes which are developed on the fiber. These dyeings generally have excellent washing fastness but the processes are relatively more costly to operate than direct dyeing methods by reason of the necessity of using a number of dyeing operations in their production. It was therefore desirable to provide dyes which would economically produce bright clear dyeings in shades of green having exceptionally good washing fastness and other good properties generally desired in dyed fabrics and to provide simple and economical methods for making such dyeings.

In the formula representing the dyes of the present invention the symbol A represents 1,3- dihydroxy benzene.

The symbol X is an aryl diamine of the kind represented by the formulae nor-Grin, and N112 wherein the amino groups in the phenylene nucleus are para or meta to each other, R is from the group consisting of hydrogen and sulfonic acid, R is from the group consisting of hydrogen, sulfonic acid, methyl and methoxy and n is an integer not greater than 2. Where there is more than one group on the benzene nucleus, the groups may be alike such as di-methyl, di-sulpho and di-methoxy, or different from each other such as methyl methoxy (-CH3 and -OCH3), methyl-sulfo (-CH: and SO3H) and methoxysulfo (-OCHs and --SOaI-I). One of the amino groups of the intermediates from which the X component is formed is acylated when the initial couplings are made but this acylamine group is eventually hydrolyzed to amino before the coupling is made with the component A.

The component Y is a l-amino-2-alkoxysulfonic acid represented by the formula alkoxy wherein alkoxy has 1 to 3 carbons and the sulfonic acid group is in the 6 or 7 position.

The component Z is an (amino-benzoylamino) 5-naphthol-7-sulfonic acid represented by the formula wherein the primary amino group is either para or meta to the -CO-- group and R" represents hydrogen, alkyl or alkoxy.

The component B is a S-phenyl-pyrazolone in which the phenyl group may or may not carry a sulfo group and to which alkyl, alkoxy or halogen groups up to two members of the group may be attached. The type is represented by the for mula contain at least 2 but not more than a sulfonicacid groups.

In making the dyes a compound X, in which one of the primary amino groups is blocked by mono-acylation thereby forming a compound a-X, is diazotized and coupled with a compound Y to form a mcnazo compound a-X+Y Wherein the symbol, (1, represents the acyl group.

This monazo compound is diazotized and coupled with a compound 2. The product of this coupling is a disazo compound represented by the gem eral formula a-X Y- Z. This diazo compound is then diazotized and coupled with an azo dye coupling component B to form a trisazo compound aX Y-+Z B. The trisazo compound is then treated to hydrolyze the acylamino group to amino, thereby producing a compound The diazo of this trisasc compound is then coupled with meta-dihydroxy benzene. The components are selected from the described classes of components so that the resulting tetra-- kisazo compound will contain 2, 3 or 4 sulfonic acid groups. The products are water soluble.

In making dyeings, the resulting compound A X Y+Z- l3 is dissolved in water to make a dyebath. Direct dyeing's in shades of green are made in well known manner by entering a suitable fabric in the bath. After the direct dyeing is made, it is treated with formaldehyde where'- upon a bright green dyeing having excellent fastness to Washing and discharge properties is produced. Both the direct and formaldehyde treated dyeing may be varied by treating with a Water solution of a copper salt.

The invention will be more fully set forth in the tfollowing more detailed description which includes examples that are given as illustrative embodiments of the invention and not as limitations thereof. Parts are expressed in parts by Weight unless otherwise noted.

Example 1 A slurry consisting of 68 parts of i-iorrnylamino-aniline and 500 parts of water is cooled to -5 C. with ice, 46 parts of 100% hydrochloric acid are added as a 30% solution and the mixture is stirred until a. complete solution is formed.

4 The compound is diazotized by adding 34.5 parts of 100% sodium nitrite as a 30% solution. A slight excess of nitrite and a temperature of 0-5 C. are maintained. The diazotization is completed in about fifteen minutes.

A slurry consisting of 127 parts of Lamina-2 methoxy-naphthalene-fi-sulfonic acid in 1000 parts of water is dissolved by adding 170 parts of sodium bicarbonate. This solution is cooled to 0 to 2 C.

Couple by slowly adding the diazo to the alkaline coupling solution over one-half hour. Stir an additional two hours to complete the coupling. Salt 5% with sodium chloride and filter out the monazo compound thus formed.

Stir to a smooth slurry the filter cake of monazo compound with 1000 parts of water and 250 parts of sodium chloride. Cool to 0 to 2 C. and add 46 parts of 100% hydrochloric acid as a 30% solution. Add 34.5 parts of 100% sodium nitrite as a 30% solution. Diazotize for two hours at 10 C. At the end of this time, filter off the solids and reslurry the press cake of diazo compound in 1000 parts of Water and cool to 0 to 2 C. with ice.

Dissolve 178 parts of 2-(3'-amino-benzoylamino) -5maphthol-7-sulfonic acid in 1500 parts of water by adding approximately 8.5 parts of 100% ammonia. Add 133 parts of sodium carbonate and 900 parts of pyridine. Cool to 0 0.

Slowly add the slurry of chase compound to the alkaline coupling solution over a period of one-half hour. Stir an additional two hours to complete the coupling. Salt 10% with sodium chloride and filter off the disazo compound thus formed. Wash the filter cake with 500 parts of 20% brine.

Stir the press cake or disazo compound in 1500 parts of water. Cool to 0 C. with ice. Add @6 parts of 100% hydrochloric and 34.5 parts of 1.00% sodium nitrite both as 30% solutions. Main tain an excess of nitrite for fifteen minutes.

Dissolve 162.5 parts of 1-(2,5'-dichlori-suliophenyl) -3-methyl-5-pyrazolone in 500 parts of water by adding 185 parts of sodium carbonate. Cool to 0 C.

Slowly add the slurry of diazotized disazo compound to the alkaline coupling solution over a period of one-half hour. After the coupling is complete, hydrolyze the formyl group by adding 90 parts of sodium hydroxide and heating to C. Maintain a temperature of 80 C. for five minutes. Cool With ice to 50 C. and add approximately 98 parts of 100% hydrochloric acid to give a negative test on Clayton Yellow paper. Salt the dye suspension 20% and fifter oil the trisazo base thus formed.

Diazotize the latter base by slurryin the filter cake thereof in 2000 parts of water, cooling to 5 C. and adding 73 parts of 100% hydrochloric acid and 34.5 parts of 100% sodium nitrite, both as 30% solutions. Maintain a distinct excess of nitrite for one-half hour.

Dissolve 68 parts of 1,3-dihydroxy benzene in 250 parts of water. Ice to 0 C. Add 133 parts of sodium carbonate. Add the diazo solution slowly over a one-half-hour period and then stir for two hours.

Heat the suspension of tetrakisazo compound thus produced to 60 C. and salt 20% with sodium chloride. Add slowly approximately 38 parts of 100% hydrochloric acid until the dye slurry is acid to Congo red paper (pl-1:20). Filter off the tetrakisazo compound and dry in an oven at C. The dry powder is dark and has a metallic lustre.

The compound is represented by the formula.

The dye may be dyed and aftertreated as follows:

Dissolve 0.2 gram of the above described product in 50 ml. water at 190-200 F., adding 0.4 gram of sodium carbonate to assist the solution. Dilute with stirring to a total volume of 500 ml. with water at approximately 160 F. Add 40 ml. of a solution of Glaubers salt. Wet out a 10-gra1n piece of rayon with water, squeeze partially dry, and enter this into the dye bath. Raise the temperature of the dye bath to 180190 F. in the course of fifteen minutes and hold the dyebath at 180-190 F. for one hour. Stir the dyeings at frequent intervals. At the end of one hour, remove the dyeing and rinse in cold water. The dyeing is a green shade.

The direct dyeing is aftertreated in a fresh bath by adding the rinsed dyeing from the above operation to 500 m1. of water at 130150 F. and then adding approximately 10 ml. of 10% formaldehyde ml. of approximately 37% formaldehyde by weight, diluted to 250 cc. with water). Hold the dyeing in the bath at this temperature for twenty minutes, and then remove the dyeing, rinse and dry.

An alternative after-treating process, which is the preferred procedure because of its economy and ease of application, is carried out at the end of the dyeing period by adding 10 ml. of 10% formaldehyde to the dyebath at bath temperature, and then removing, rinsing and drying the dyeing after twenty minutes treatment.

A dyeing with a bright green shade is obtained which has excellent fastness to washing and yields white discharges.

As the first component, an equivalent amount of B-iormyIaminO-aniline can be used in the foregoingv example instead of i-formylamino-aniline with similar effect; and as the second or Y component, an equivalent of any 6- or 7-monosulfonic acid of 1-amino-2-methoxy-naphthalene, or a corresponding Z-ethoxy derivative can be used, such as 1-amino-2-ethoxy-naphthalene-7-sulfonic acid or 1-amino-2-methoxy-naphthalene- 7-sulfonic acid.

Similar results are obtained by using an equivalent of 1-amino-2-n-propoxynaphthalene-6- sulfonic acid in the foregoing process instead of l-amino-2-methoxy-naphthalene-6-sulfonic acid.

Example 2 Slurry 140 parts of -acetylamino-l-aminonaphthalene-fS-sulfonic acid in 1000 parts of wahydrochloric acid as a 30% solution. Add 34.5 parts of sodium nitrite as a 30% solution over 5-10 minutes and diazotize for one-half hour at 14-15 C..

Dissolve 127 parts of l-amino-Z-methoxynaphthalene-G-sulfonic acid in an alkaline solution consisting of 1000 parts of water and 170 parts of sodium bicarbonate. Cool the solution to 0 C. and slowly add the diazo slurry to the alkaline coupling solution over one-half hour. Stir the mixture for two hours and then salt the above-prepared first combination 15%.

Diazotize the monazo compound thus formed at 8 C. by adding 73 parts of 100% hydrochloric acid and 34.5 parts of 100% sodium nitrite as 30% solutions. Diazotize for one hour.

Dissolve 178 parts of 2-(3'-amino-benzoylamino) -5-naphthol-7-sulfonic acid in an alkaline solution composed of 1000 parts of water and 8.5 parts of 100% ammonia. Ice this solution to 0 C. and add 133 parts of sodium carbonate and 900 parts of pyridine.

Mix the diazo of the monazo compound and the alkaline coupling solution by slowly adding the diazo solution over a period of one-half hour and then stir the mixture an additional two hours. Salt 10% with sodium chloride, filter off the disazo compound and wash the filter cake with 100 parts of 20% brine.

Slurry the filter cake of disazo compound in 1000 parts of water and cool to 5 C. Diazotize by adding 46 parts of 100% hydrochloric acid and 34.5 parts of 100% sodium nitrite. Maintain the diazotization mixture at a temperature of 10 C. and with an excess of nitrite for one and onequarter hours.

Dissolve 162.5 parts of 1-(2',5'-dichloro-4-sulfophenyl)-3-methyl-5-pyrazo1one in an alkaline solution composed of 500 parts of water and 185 parts of sodium carbonate and cool the solution to 0 C.

Mix the diazo slurry and the solution of alkaline coupling component by slowly adding the diazo slurry thereto over a period of one-half hour. After the coupling is complete, hydrolyze the acetyl group by adding parts of sodium hydroxide and heating to 90 C. This requires about five minute-s heating at 90 C. Cool the resulting mixture with ice to 50 C. and add approximately parts of 100% hydrochloric acid to give a negative test on Clayton Yellow paper. Then recover the trisazo compound by/salting the dye suspension 20% and filtering.

.Diazotize the resulting hydrolyzed base by have ethoxy, propoxybutoxy, pentoxy orhexoxy slurrying the filter cake in 2000 parts of water, instead of methoxy attached to the benzene nucooling to 5 C. and adding '73 parts of 100% hycleus, 2-(3-amino 4 methylbenzoylamin)-5- 'drochloric acid and 34.5 parts of 100% sodium naphthol-7-sulfonic acid and the corresponding nitrite, both as a 30% solution. Maintain a temethyl, propyl, butyl, pentyl and hexyl derivatives. perature of C. and a distinct excess of nitrite As other illustrations of B components which forone and one-half hours. may be used are 1-phenyl-5-pyrazolone-3-car- Dissolve 55 parts of 1,3-dihydroxy-benzene'in boxylic acid, 1-(3-methy1pheny1)-3-methy1-5- 250 parts of water, ice to 0 C.-and then make alpyrazolone, 1-(3'-su1fophenyl) -3-methyl 5- pykaline by adding 133 parts of sodium carbonate. 10 razolone,1-(2'-chloro-5-sulfophenyl)-3-methyl- Mix the solution of coupling component and the 5 pyrazolone, 1 (-chloro-3-sulfophenyl) -3- diazo by slowly adding the diazo to the solution methyl-5-pyrazolone, 1-( l'-methyl-2-sulfophenof coupling component over'a-one-half-hour peyl)-3-methyl-5-pyrazo1one, 1 (4-sulfophenyl)- riod and-then stir for two hours. S-pyrazoione 3 carboxylic acid, 1-(4'-ethoxy- Heat the dye suspension thus form-ed to 60 C., 5 phenyl) -3-methyl-5-pyrazolone, 1-(3'-sulfophensalt with sodium chloride and then add 38 yl)-5-pyrazolone-3-carboxylic acid, 1-(4'-n-proparts of 100% hydrochloric acid slowly until the pylphenyl) -3-methyl-5-pyrazolone, 1-(4'-n-prodye suspension is acid to Congo red paper poxyphenyl)-3-methyl-5-pyrazolone, 1-(2',5-di- (pI-I=2.0). Filter and dry at '80 C. The dry methoxyphenyl)-3-methyl-5-pyrazolone, 1- (2'- tetrakisazo compound is a dark powder having a 20 chloro-3'-sulfophenyl) -3methyl 5 pyrazolone metallic lustre. and 1-(3,4-dichlorophenyl) -3-methyl-5-pyrazo- The compound in its acid form is represented by lone. the formula The preferred types of products arethose in ion: (311 no- N=N on HOS- NHC-C "I soda III I? CHz-*(i;,()-N

When dyed and aftertreated in a manner analwhich the A component is 1,3-dihydroxybenzene ogous to that described-in Example 1, the product and the Z component is 2-(3-amino-benzoylamiyields dyeings in clear green shades having exno) -5-naphthol-7-sulfonic acid. cellent fastness and yielding white discharges. Dyeings on cotton can be improved'in light Exceptias noted,.the'o1l-owing Examples 3 to 5 fastness by an after-treatment with a soluble were carried out the same as Example 1. copper salt. This treatment may beapplied sim- Exomple A Component -X Component Y Component Z Component 13 Component 3' 1,3-dihydroxy benzene. 4-formylamlnoaniline.- Lamino-Z-methoxynaph- 2-(3'-an1inobenzoylami- 1 -(4' sulfophenyl) 3 thalene-d-snlfonic acid. 1o) -5-n |g)hthol-7-sulmethyl-fi-pyrazolone.

01110 801 4' 1,3-dlhydroxy benzene. 4-f0rn1y1aminoaniline... 1-amino-2-methoxynaph- 2-(3-aminobenzoylamil-phenyl-3-mctliyl-5- thaIene-G-sulionic acid. l0) -5-Ili)hth01-7-Sll1- pyrazolonei OnlC 8C1 5 1,3-dlhydrcxy benzene. 4-(acetylamlno)-1-aminol-amino-zmethoxynaph- 2-(3'-ami.nobenzoylamil-phenyl-3-1nethyl-5- naghthalene-Tsultomc thalene-fi-sullonic acid. no)-5-n?Jhtho1-7-sulpyrezolone. ac ionic ac Shade of aftertreated dyeing: green.

Asillustrations'of othepco'mponentswhich may llarly to the formaldehyde treatment by substibe used'as X componentsiormaking dyes having tuting a soluble copper salt in suitable amount for properties-similar to those described are S-acetylformaldehyde or by adding the soluble copper salt amino-aniline, 4-oxalylamino-3-sulfo-aniline, 4- to the formaldehyde bath afterthe formaldehyde oxalylamino-3-methylaniline, 4-oxaly1amlno-2- treatment is completed, methoxyaniline, :4-oxalylamino- 2-- methoxy-S- 'The compounds of"thepresent invention promethylaniline, 4-oxalylamlno 2,5'- dimethylanivide dyeings which are characterized by excellent line, '4 acetylamino-l-aminonaphthalene, 4-forwashing fastness in bright shades and 'whichdo mylamino-2,5-dimethoxyaniline, i-oxalylaminonot stain undyed fiber that is in contact with fi-sulfo-2- methylanillne and 4-formylamino-5- the dyed fiber during washing, In general the sulfo-2-methoxyaniline. washing fastness of formaldehyde-treated dye- As other illustrations of Z components which ings is equal to the Washingfastness of diazo colmay be used are -2-(4'-aminobenzoy1amino)-5- ore of similar shade and it is sometimes superior. naphthol-7-sulfonic .acid,2-(3' amino-4 meth- Thus dyeings of at least equal iastness can be oxy-benzoylamlno)-5- naphthol-7-sulfonic acid, obtained with the dyes of the present invention the corresponding naphtholsulfonlc-acids which 76 with relatively moderate eifort and at moderate 9 10 ,.v operational expense. The dyeings made with the ionic acid; Z is one of the group consisting of hypresent invention do not change materially in drogen, sulfonic acid, methyl and methoxy; m is shade during the treatment with formaldehyde 1 to 2 and the free bonds represent the positions and they are much more easily manipulated than of attachment of azo groups; Q is one of the the diazo colors which change shade materially 5 radicals upon bein developed. 0 0

From the foregoing disclosure it will be recogg nized that the invention is susceptible of modi- O I Q ilcation without departing from the spirit and scope thereof and it is to be understood that the O 0 invention is not restricted to the specific illustrai tions thereof herein set forth. and 5 "C We claim: 1. A tetrakisazocompound which in its acid form is represented by the formula where alkyl and alkox'y have 1 to 6 carbons and on on R!!! (RI!!!)l in; which one X is hydrogenand the other is suieach free bond on the benzene rings represents ionic acid; alkoxy has 1 to 3 carbons; the arylene the position of attachment of azo group; radical is represented by a formula of the group is one of the group consisting of hydrogen and sulfonic acid; 13''" is from the group consisting of hydrogen, chlorine, bromine, alkyl having not I I more than 3 carbons and alkoxy having not more Y Y 5 than 3 carbons, and n is an integer not greater than 2; and R is one of the group consisting of and k methyl and cal-boxy; said dyestuff having 2 to 4 (z sulfonic acid groups.

40 2. The compound represented by the formula wherein one Y is hydrogen and the other is sul- OCHs OH 3. The compound represented by the formula aBI 11 4. The compound representedby the formula HOJS SOsH

CHILES SPARKS. Number JAMES W. LIBBY, JR. 1,784,617 JOSEPH I-I. TREPAGNIER. 20 1,965,201- 2,018,764 REFERENCES CITED Re. 22286 The following references are of record in the R 22,237 file of this patent:

UNITED STATES PATENTS 25 Number Number Name Date 622,974 1,730,297 Hentrich et a1 Oct. 1, 1929 469,288 1,736,905 Fellmer Nov. 26, 1929 0=c /N. N

SOaH

Name Date Woodward Dec. 9, 1930 Murphy July 3, 1934 Paine Oct. 29, 1935 Rossander et a1. Mar. 9, 1943 Sparks et a] Mar. 9, 1943 FOREIGN PATENTS Country Date France Mar. 8, 1927 Germany Dec; 8 1928 

